Array Accelerator Battery Charge Low - Error: 94 - HP DL 380 G5

Hi Guys,

I found this error

Post Error - Message: 1794-Drive Array - Array Accelerator Battery Charge Low - Error: 94

in diagnostic utility on a server HP DL 380 G5.

The server automatically shutdown.

The controller is an HP Smart Array P400 Controller.

Last week it  has shut down every day.

In this week instead it has shut down only today,  never in the last days.

The controller firmware version is 5.22.

What can I do?

This update is required to solve the problem?

http://h20565.www2.hp.com/portal/site/hpsc/template.PAGE/public/psi/swdDetails/?sp4ts.oid=1157689&spf_p.tpst=swdMain&spf_p.prp_swdMain=wsrp-navigationalState%3Didx%253D2%257CswItem%253DMTX_54c7c2f6b55a40f19af538de11%257CswEnvOID%253D1005%257CitemLocale%253D%257CswLang%253D%257Cmode%253D4%257Caction%253DdriverDocument&javax.portlet.begCacheTok=com.vignette.cachetoken&javax.portlet.endCacheTok=com.vignette.cachetoken

thank you for help